| 摘要 |
PURPOSE:To prepare an indwelling needle having constant quality with good productivity, by a method wherein the outer needle of an indwelling needle, whose leading end part is not formed, constituted of a needle base and a tube made of a thermoplastic resin is inserted in a mold heated to predetermined temp. in such a state that a core metal is inserted in said outer needle to be fixed thereto and only the core metal is subsequently pushed in the mold up to a predetermined position. CONSTITUTION:A core metal 4 is inserted in the tube 3 of the outer needle 1 of an indwelling needle whose leading end part is not formed. Next, the tube 3 having the core metal 4 inserted therein is inserted in a mold 5, which has a hole diameter larger than the outer diameter of the core metal 4 and smaller than the outer diameter of the tube 3, preheated to predetermined temp. After the tube 3 is heated for a predetermined time and softened, the core metal 4 is further pushed in while the needle base 2 of the outer needle 1 is held and the leading end of the core metal is allowed to protrude by several mm from the cavity of the mold while the tube 3 is stretched. After the tube 3 is cooled, the core metal 4 is pulled off and, at last, the leading end part of the tube 3 is cut at a predetermined position.
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